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ext4: DAX iomap write support

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Implement DAX writes using the new iomap infrastructure instead of
overloading the direct IO path.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara
2016-11-20 18:09:11 -05:00
committed by Theodore Ts'o
parent 47e6935136
commit 776722e85d
2 changed files with 160 additions and 6 deletions
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40
fs/ext4/file.c
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@@ -169,6 +169,41 @@ static ssize_t ext4_write_checks(struct kiocb *iocb, struct iov_iter *from)
return iov_iter_count(from);
}
#ifdef CONFIG_FS_DAX
static ssize_t
ext4_dax_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
struct inode *inode = file_inode(iocb->ki_filp);
ssize_t ret;
bool overwrite = false;
inode_lock(inode);
ret = ext4_write_checks(iocb, from);
if (ret <= 0)
goto out;
ret = file_remove_privs(iocb->ki_filp);
if (ret)
goto out;
ret = file_update_time(iocb->ki_filp);
if (ret)
goto out;
if (ext4_overwrite_io(inode, iocb->ki_pos, iov_iter_count(from))) {
overwrite = true;
downgrade_write(&inode->i_rwsem);
}
ret = dax_iomap_rw(iocb, from, &ext4_iomap_ops);
out:
if (!overwrite)
inode_unlock(inode);
else
inode_unlock_shared(inode);
if (ret > 0)
ret = generic_write_sync(iocb, ret);
return ret;
}
#endif
static ssize_t
ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
@@ -178,6 +213,11 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
int overwrite = 0;
ssize_t ret;
#ifdef CONFIG_FS_DAX
if (IS_DAX(inode))
return ext4_dax_write_iter(iocb, from);
#endif
inode_lock(inode);
ret = ext4_write_checks(iocb, from);
if (ret <= 0)